By helping animals settle down for the night in 'Nighty Night, Little Sheep! HD' by Shape Minds and Moving Images GmbH, kids learn the importance of quieting down before going to sleep. (Gannett/File)

Written by

Jinny Gudmundsen, Special to USA TODAY

Many bedtime routines with little kids involve snuggling up and enjoying a good book. These days, scores of families are reading those good books on their iPads, iPhones and smartphones via apps. Book apps encourage kids to participate in the adventures by tapping and swiping to move the story along. Here are some charming book apps that are perfect for bedtime reading.Nighty Night, Little Sheep! HD

From Shape Minds and Moving Images GmbH, best for ages 2-5, $2.99, iPad (iPhone and iPod Touch version costs $.99)